
html body{
  background-color: #fff;
  font-family: "helvetica neue",arial,sans-serif,"微软雅黑";
  height: 100%;
}
*{
  margin: 0;
  padding: 0;
}

.masthead{
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  width: 100%;
  height: 60px;
  line-height: 60px;
  /* background: rgb(255,255,255); */
  /* box-shadow: 0 2px 2px #e8e8e8; */
}
.masthead-nav{
  width: 1200px;
  height: 60px;
  margin: auto;
  overflow: hidden;
}
.logo{
  float: left;
  display: table-cell;
  vertical-align: middle;
  width: 282px;
  height: 60px;
}
/* .logo img{
  width: 100%;
  height: 100%;
} */
.nav{
  float: left;
  margin-left: 180px;
  display: block;
  /* box-sizing: border-box; */

  overflow: hidden;
  font-weight: 700;

}
.nav ul{
  float: left;
  font-size: 18px;
  /* box-sizing: border-box; */

  /* font-weight: bold; */
  margin: 0;
  padding: 0;
  margin-left: 60px;
  display: block;
  line-height: 60px;
  font-weight: 700;

}
.nav ul li{
  list-style-type: none;
  display:inline-block;
  margin-left: 60px;
  /* box-sizing: border-box; */
  height: 60px;
  font-weight: 700;

}
.nav li a span:last-child{
  color: #ffffff;
  /* box-sizing: border-box; */
  font-size: 16px;
  font-weight: 700;
}
.nav li a:link{
  color: #ffffff;
  /* box-sizing: border-box; */
  font-weight: 700;

}
.nav li a:visited{
  color: #ffffff;
  box-sizing: border-box;
  font-weight: 700;

}
.nav li a:hover,
.nav li a.current{
  height: 40px;
  /* box-sizing: border-box; */

  /* border-bottom: 2px solid #0b97ee; */
  width: 100%;
  color: #0b97ee;
  font-weight: 700;

  /* font-weight: 700 !important; */
}
.nav li a:hover span:last-child,
.nav li a.current span:last-child{
  color: #0b97ee;
  /* font-weight: 700; */
  /* box-sizing: border-box; */

  font-weight: 700;

}
.nav li a{
  display: inline-block;
  text-align: center;
  font-size: 16px;
  /* box-sizing: border-box; */

  text-decoration: none;
  font-weight: 700;


}
.nav li a span{
  display: block;
  height: 30px;
  /* box-sizing: border-box; */

  line-height: 40px;
  font-weight: 700;

}
.but{
  float: left;
  margin-left: 110px;
}
.but button{
  width: 80px;
  height: 36px;
  background-color: transparent;
  color: #1b92fb;
  cursor: pointer;
  border: 1px solid #1b92fb;
}
.but button:last-child{
  background: #1b92fb;
  margin-left: 20px;
  color: #ffffff;
}